Stereotype plate casting mold



L 19, 1937. W- F, HUCK 2,095,985

STEBEOTYPE PLATE CASTING MOLDS Filed oct. 51, 1954 l :l Illllllls Patented Oct. 19, 1937 2,095,985 i s'rEREorYrE PLATE CASTING MOLD PATENT ermee William F. Huck, nichmondniu, N. Y., assigner, by merspneassignments, to R. Hoe & Co., Inc., NewYork, N Y., `a. corporation of New York Application 'october 31, 1934, serial No. 750,771

4 claims.

This invention relates to stereotype plate casting molds and more particularly to a means for arranging a matrix on the surface of one of the mold members in such manner as to per` mit the matrix to expand or contract equally in all directions in response totemperature changes when heated by the stereotype plate metal during the process of plate casting and cooling, to thereby maintain the printing surface in the same relation to all edges of the plate.

The principal object of the invention thereforeis to provide means whereby a matrix is adapted to be properly located on one surface of a mold member, and further includes means to permit said matrix to expand or contract equally in all directions in response to temperature changes.

With the foregoing and other objects in View, which Will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described.

The preferred embodiment of the invention is illustrated in the accompanying drawing, Where- Figure 1 is an inverted plan view looking at the working surface of a mold member on whicha matrix is mounted, and shows the same with parts broken away and with matrix aligning pins arranged in the mold and engaging slotted por-l tions ofthe matrix, said pins being shovvnV in section; and

Figure 2 is a vertical cross section through the mold members including a matrix and a' cast stereotype plate.

VReferring to Figure 2, one form of stereotypeV mold is represented which includes a core mem.' ber II having a. convex surface I2, and a shell on cover member I3 having a concave surface I4 Which conforms with the convex surface I2. Further members, which are provided to complete the mold assembly, include a surface coveringl I4 of insulating material which is stretched over the convex surface I2 of the core member for the purpose of equalizing thercooling effects', and

clamping straps, one of which is shown at I5,

slots, which are cut through and perpendicular to the edges of the rectangular matrix and are arranged in pairs one at each side, preferably at substantially the center thereof. Vof each slot as shown in Figure 1, is made substantially the same as the diameter of the pins but the slots are 'elongated to permit expansion or contraction of the matrix. The openings are so positioned at the margins or edges of the matrix that a straight line joining a pair of said openings as an axis, Will bisect and, be perpen-i di-cular toa similar line `connecting another pair of said openings, each opening accordingly being1 vin axial alignment with its oppositely positioned opening. With the slots arranged in this manner, it will be observed that when expansion or contraction occurs, it will be in an' outward direction from each pin position, and since'the pins are centrally positioned with respect to the edges of the matrix, the expansion or contraction' will be equal in all directions.

When the matrix is assembled on the surface I 4 of the shell member I3, it is placed so that the pins I6 Will engage the slots I'I as shown in Figure 1 and is then held in said shell by suitable holding members I9. After moving the shell to the position shown in Figure 2, the mould is complete and is ready for the molten plate metal to be poured in the cavity provided between the matrix and the covering I4', which operation may be accomplished in any desired manner.

It Will thus be observed that a simple and effective means has been provided for arranging a matrix in a stereotype mold which assuresi the proper relation of the printing surface of the plate With respect to the edges thereof, after expansion or contraction occurs Within the matrix. It will be understood that the changes in dimensions of greatest extent are caused by shrinkage of the matrix when the molten metal comes in contact With it, and With the arrangement shown, the shifting of any portion of the matrix under this condition is held to a minimum, for the center point of the matrix is held immovable and the contraction is equal in all directions radial from the center. It Will be seen that the arrangement provides for the accurate register of type sections of any number of duplicate plates, Which is particularly important in multi-color printing.

It will be understood that the invention may be embodied in other specific forms Without departing from the spirit or essential attributes thereof and it is therefore desired that the present embodiment be considered in all respects as The Width illustrative and not restrictive, reference being had to the claims rather than to the foregoing description to indicate the scope of the invention.

What I claim is: Y

1. In a stereotype plate casting mold, a mold member having one surface arranged to receive a matrix, pins projecting beyond said surface, and a rectangular matrix having one elongated slot arranged perpendicularly to the respective edge of each side and intermediate the ends thereof, which slots are adapted to be /engaged by said pins, whereb3r said matrix is maintained in a desired position in the mold and is permitted to expand or contract equally in opposite directions in response to temperature changes.

2. In a stereotype plate casting mold, a mold member having one surface arranged toreceive a matrix, pins projecting beyond said surface, and a rectangular matrix having one elongated slot arranged perpendicularly to the respective edge of each side intermediate the ends thereof and cut through said edges, which slots are adapted to be engagedby said pins, wherebyl said matrix is maintained in a desired position in the mold and is permitted to expand or contract equally in opposite directions in response to temperature Achanges 3. In combination, a rectilinear stereotype matrix having'slots each perpendicular to and subwhereby said matrix is maintained in a desired position in the mold though permitted to move elsewhere than at its center when shrinkage of the matrix occurs incident to casting.

4. In a means for casting a stereotype plate, the combination of a mold member having two pairs of protrusions on its casting surface, each pair of protrusions being so positioned that the shortest line connecting them and following the said surface, intersects the shortest line connecting the other pair of protrusions and following the said surface, the said lines forming angles of approximately at their point of intersection; with a matrix having two pairs of openings, the openings of each pair being adjacent opposite edges of the matrix, each pair of openings having two parallel sides and being so position that the shortest line connecting one pair and following the plane of the matrix intersects with the shortest similar line connecting the other pair, and the said lines form angles of approximately 90 at their point of intersection; the distances from the intersection of the said lines relating to the mold member and each of the said protrusions being similar to the distances from the intersec tion ofthe lines relating to the matrix and each of the said openings, whereby the openings in the matrix will fit over the protrusions and so position the matrix on the mold member that all parts of the matrix may contract or expand with relation to the point at the'intersection of said lines.

WILLIAM F. HUCK. 

